Submission #1147432

#	Time	Username	Problem	Language	Result	Execution time	Memory
1147432		koukirocks	Gift Exchange (JOI24_ho_t4)	C++20	8 / 100	30 ms	3144 KiB

Main

#include <bits/stdc++.h>
#define F first
#define S second
#define speed ios_base::sync_with_stdio(0);cin.tie(0)
#define all(x) x.begin()+1, x.end()

using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

template<class T>
using vvector = vector<vector<T>>;

const ll oo = 0x3f3f3f3f3f3f3f3f;
const ll INF = 0x3f3f3f3f;

int main() {
    speed;
    int n;
    cin>>n;
    vector<pii> a(n+1),b(n+1);
    bool flag=false;
    vector<int> pre(n+1);
    for (int i=1;i<=n;i++) {
        cin>>a[i].F;
        a[i].S=i;
    }
    for (int i=1;i<=n;i++) {
        cin>>b[i].F;
        if (b[i].F==2*n-1) flag=true;
        b[i].S=i;
        if (i==1) continue;
    }
    vector<bool> lft(n+1),rt(n+1);
    for (int i=1;i<=n;i++) {
        if (i==1 or a[i-1].F<b[i].F) lft[i]=true;
        if ((i==n or a[i].F<b[i+1].F)) rt[i]=true;
        pre[i]=pre[i-1]+(lft[i] and rt[i]);
    }
    int q;
    cin>>q;
    while (q--) {
        int l,r;
        cin>>l>>r;
        if (lft[r] or rt[l]) cout<<"No\n";
        else if (pre[r]-pre[l-1]) cout<<"No\n";
        else cout<<"Yes\n";
    }
    return 0;
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 5
• Subtask 3: 0 / 10
• Subtask 4: 0 / 31
• Subtask 5: 8 / 8
• Subtask 6: 0 / 12
• Subtask 7: 0 / 18
• Subtask 8: 0 / 12